package com.hmdp.utils;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;


public class RefreshTokenInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取token
        String token=request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        String key = LOGIN_USER_KEY + token;
        //2.基于Token获取redis中的用户
        Map<Object,Object> userMap=stringRedisTemplate.opsForHash()
                .entries(key);
        //3.判断用户是否存在
        if(userMap.isEmpty()){
            return true;
        }
        //5.将查询到的数据转换为UserDto对象
        UserDTO userDTO= BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);

        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);


//        //1.获取session
//        HttpSession session=request.getSession();
//        //2.获取session中的用户
//        Object user=session.getAttribute("user");
//        //3.判断用户是否存在
//        if(user==null){
//            //4.不存在，拦截，返回401状态码
//            response.setStatus(401);
//            return false;
//        }
//        //5.存在，保存用户信息到ThreadLocal
//        UserHolder.saveUser((UserDTO) user);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
